Imagery is a description of sensory experience; as such, it can be visual (describing something we could see), auditory (describing something we could hear), olfactory (describing something we could smell), tactile (describing something we could touch or feel), or gustatory (describing something we could taste). One image used in the poem describes how
all the birds are faint with the hot sun,
And hide in the cooling trees . . .
This is both visual and tactile, as we can see how the birds in the trees would look and feel the heat of the sun and the cooling shade of the trees. Another visual image describes the grasshopper, who "rests at ease beneath some pleasant weed." It is not hard to imagine the sight of this still grasshopper, sheltering beneath some pretty green plant. Another set of images describes a colder season:
On a lone winter evening, when the frost
Has wrought a silence, from the stove there shrills
The Cricket's song . . .
We can see the frosty winter scene and hear the total lack of sound and, then, the "shrill" chirping of the cricket.